I agree with this. I just had my 2nd ride. We go out, stop, do feed back and then come back. it could be more constant. On the VFR the rearward viability requires more effort. I have to spend 40% of my attention searching for the observer to see what his signals are! A simple; "turn left here" would fix that. I agree with the immediate feedback thing. My instructor for my DVLA test would use the radio to say things like, "see that person at the crossing - that means the lights could turn red any moment", "look over the hedge to the right and you will see there's a tractor coming in the opposite direction". This was really helpful in pointing out what was meant by "observation". But as for looking in the mirrors for signals - the counter argument would be that a glance in your mirrors is usually worthwhile when approaching any junction, so you know what's behind you in case you needed to brake, and it shouldn't take up too much of your attention to do this. I find that whenever I come to do my retest, I realise I've been neglecting my mirrors, and a couple of observed rides is enough to help me find them again. This is where it has to be careful. They are observers they are not trainers/instructors and are not insured to teach /train So if they gave you 'instructions' via Comms and an incident occured by you following their instruction then brown smelly stuff hits rotating air distribution unit . During debriefs / mid ride chats it should be points for you to consider not that you should do this or that . By an observer signalling it is a suggestion or at most a request both of which it is your choice to follow and even through comms it should be voiced in the similar vein . The essence of Advanced Riding is that you teach yourself not to be taught .